tim x
(4*x+28)*(3+55):5=35
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a) \(\left[\left(4x+28\right).3+55\right]:5=35\)
\(\Leftrightarrow\left(4x+28\right).3+55=35.5\)
\(\Leftrightarrow\left(4x+28\right).3+55=175\)
\(\Leftrightarrow\left(4x+28\right).3=175-55\)
\(\Leftrightarrow\left(4x+28\right).3=120\)
\(\Leftrightarrow4x+28=120:3\)
\(\Leftrightarrow4x+28=40\)
\(\Leftrightarrow4x=40-28\)
\(\Leftrightarrow4x=12\)
\(\Leftrightarrow x=12:4\)
\(\Leftrightarrow x=3\)
Vậy \(x=3\)
b) \(\left(12x-4^3\right).8^3=4.8^4\)
\(\Leftrightarrow12x-4^3=4.8^4:8^3\)
\(\Leftrightarrow12x-4^3=4.8^{4-3}\)
\(\Leftrightarrow12x-4^3=4.8\)
\(\Leftrightarrow12x-4^3=32\)
\(\Leftrightarrow12x-64=32\)
\(\Leftrightarrow12x=32+64\)
\(\Leftrightarrow12x=96\)
\(\Leftrightarrow x=96:12\)
\(\Leftrightarrow x=8\)
Vậy \(x=8\)
c) \(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=8.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=40\)
\(\Leftrightarrow41-\left(2x-5\right)=720:40\)
\(\Leftrightarrow41-\left(2x-5\right)=18\)
\(\Leftrightarrow2x-5=41-18\)
\(\Leftrightarrow2x-5=23\)
\(\Leftrightarrow2x=23+5\)
\(\Leftrightarrow2x=28\)
\(\Leftrightarrow x=28:2\)
\(\Leftrightarrow x=14\)
Vậy \(x=14\)
[ { 4 x X + 28 } x 3 + 55 ] : 5 = 35
[ { 4 x X + 28 } x 3 + 55 ] = 35 x 5
[ { 4 x X + 28 } x 3 + 55 ] = 175
{ 4 x X + 28 } x 3 = 175 - 55
{ 4 x X + 28 } x 3 = 120
4 x X + 28 = 120 : 3
4 x X + 28 = 40
4 x X = 40 - 28
4 x X = 12
X = 12 : 4
X = 3
(4*X+28)*3+55=35*5
=>(4*X+28)*3+55=175
=>(4*X+28)*3=120
=>4*X+28=40
=>4*X=12
=>X=3
a.70 -5.(x-3)=45
x-3=70-5-45
x-3=20
x=20-3=17
b.2x-138=8.9
2x-138=72
2x=72+138
2x=210
x=210:2=105
c.10+2n=16
2n=16-10
2n=6
n=6:3=2
d.[(4x+28).3+55]:5=35
[(4x+28).3+55]=35x5=175
4x+28=(175-55):3
4x+28=40
4x=40-28=12
x=12:4=3
Dung thi k mk nha
Chuc bn hoc gioi nha
[(4 : x + 28).3+55]:5=35
(4:x+28).3+55=35.5=175
(4:x+28).3=175-55=120
4:x+28=120:3=40
4:x=40-28=16
x=4:16
=>x=0,25
(4*x+28)*(3+55) :5=35
(4*x+28)*58 =35.5
(4*x+28)*58= 175
4*x+28=\(\frac{175}{58}\)
4 * x = \(\frac{175}{58}-28\)
4 * x = \(\frac{-1449}{58}\)
x = \(\frac{-1449}{58}:4=\frac{-1449}{232}\)
{ ( 4 . x + 28 ) . 3 + 55 } = 35 . 5
{ ( 4 . x + 28 ) . 3 + 55 } = 175
{ ( 4 . x + 28 ) . 3 } = 175 - 55
{ ( 4 . x + 28 ) . 3 } = 120
{ ( 4 . x + 28 ) } = 120 : 3
4 . x + 28 = 40
4 . x = 40 - 28
4 . x = 12
x = 12 : 4
x = 3
a) \(128-3\left(x+4\right)=23\)
\(\Rightarrow3\left(x+4\right)=128-23\)
\(\Rightarrow3\left(x+4\right)=105\)
\(\Rightarrow x+4=35\)
\(\Rightarrow x=35-4\)
\(\Rightarrow x=31\)
b) \(\left[\left(4x+28\right)\cdot3+55\right]:5=35\)
\(\Rightarrow\left(4x+28\right)\cdot3+55=35\cdot5\)
\(\Rightarrow\left(4x+28\right)\cdot3+55=175\)
\(\Rightarrow\left(4x+28\right)\cdot3=120\)
\(\Rightarrow4x+28=40\)
\(\Rightarrow4x=12\)
\(\Rightarrow x=3\)
a, \(128-3\left(x+4\right)=23\)
\(=>3\left(x+4\right)=128-23\)
\(=>3\left(x+4\right)=105\)
\(=>x+4=105:3\)
\(=>x+4=35\)
\(=>x=35-4\)
\(=>x=31\)
b, \(\left[\left(4x+28\right).3+55\right]:5=35\)
\(=>\left(4x+28\right).3+55=35.5\)
\(=>\left(4x+28\right).3+55=175\)
\(=>\left(4x+28\right).3=175-55\)
\(=>\left(4x+28\right).3=120\)
\(=>4x+28=120:3\)
\(=>4x+28=40\)
\(=>4x=40-28\)
\(=>4x=12\)
\(=>x=12:4\)
\(=>x=3\)
\(#WendyDang\)
a: =>3(x+4)=115
=>x+4=115/3
hay x=103/3
b: =>\(8^3\cdot\left(12x-64\right)=4\cdot8^4\)
\(\Leftrightarrow12x-64=32\)
=>12x=96
hay x=8
c: \(\Leftrightarrow\left(4x+28\right)\cdot23+55=175\)
=>(4x+28)x23=120
=>4x+28=120/23
=>4x=-524/23
hay x=-131/23